Blacksmiths make and use gas forges a lot these days. Usually propane and air. Our forges always premix fuel and air. The problem SEEMS to be similar, but I hardly ever hear of the flame burning back in the burner tube.
Some are naturally aspirated and some use small (or not so small) blowers to supply air for combustion. Here is my personal favorite design: http://www.spaco.org/Blacksmithing/PipeForge/PipeForgeAndPropane.htm In this model, I run as high as about 10 psi propane through a 1/16" dia. Orifice and use a little blower in the range of 20- 120 cfm, but severly choked down. BYW, this model easily gets up to forge welding temperatures; not all gas forges do that. Once the forge is well heated, I usually reduce the pressure to about 2-5 psi. You mentioned "thermo acoustics" or some such: All of these gas forges make a fair amount of noise. Unless something is wrong, the noise is a steady white-noise-like drone, a lot like what you'd expect from large weed burner. There is NO pulsation. Maybe what is happening in your system is similar to what made the V1 work? I don't know if any of this would apply to your situation, but maybe there is some food for thought. Note the simple design of the flame tube. I can see from my limited experience, though, that the issue of pressure drop when you only have several inches/water column to deal with, is real. Still looking for the perfect grid tie controller in the 30-50KW single phase range (and just bought a 30KW Onan Genset about an hour ago, Pete Stanaitis -----------------
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